Investigating SemaphoreSlim on net6.0+

[mgravell]

Investigating SemaphoreSlim on net6.0+

[NickCraver]

Slimming down the above table to compare what we are asking here: MutexSlim vs. SemaphoreSlim:

Method	Runtime	Mean	Error	StdDev	Allocated
SemaphoreSlim_Sync	.NET 6.0	18.246 ns	0.2540 ns	0.2375 ns	-
MutexSlim_Sync	.NET 6.0	22.292 ns	0.1948 ns	0.1627 ns	-
SemaphoreSlim_Sync	.NET 4.7.2	65.291 ns	0.5218 ns	0.4357 ns	-
MutexSlim_Sync	.NET 4.7.2	43.145 ns	0.3944 ns	0.3689 ns	-
SemaphoreSlim_Async	.NET 6.0	20.920 ns	0.2461 ns	0.2302 ns	-
MutexSlim_Async	.NET 6.0	42.810 ns	0.4583 ns	0.4287 ns	-
SemaphoreSlim_Async	.NET 4.7.2	57.513 ns	0.5600 ns	0.5238 ns	-
MutexSlim_Async	.NET 4.7.2	76.444 ns	0.3811 ns	0.3379 ns	-
SemaphoreSlim_Async_HotPath	.NET 6.0	15.182 ns	0.1708 ns	0.1598 ns	-
MutexSlim_Async_HotPath	.NET 6.0	29.913 ns	0.5884 ns	0.6776 ns	-
SemaphoreSlim_Async_HotPath	.NET 4.7.2	50.912 ns	0.8782 ns	0.8215 ns	-
MutexSlim_Async_HotPath	.NET 4.7.2	55.409 ns	0.7513 ns	0.6660 ns	-
SemaphoreSlim_ConcurrentAsync	.NET 6.0	2,084.316 ns	4.5909 ns	4.0698 ns	547 B
MutexSlim_ConcurrentAsync	.NET 6.0	2,120.714 ns	28.5866 ns	26.7399 ns	125 B
SemaphoreSlim_ConcurrentAsync	.NET 4.7.2	3,812.444 ns	42.4014 ns	37.5877 ns	1,449 B
MutexSlim_ConcurrentAsync	.NET 4.7.2	2,883.994 ns	46.5535 ns	41.2685 ns	284 B